STPM Biology - chapter 4(old syllabus) chapter 6 (new syllabus): Revision essay question 3

3. Explain the differences between cyclic and non-cyclic photophosphorylation


Answer:

cyclic phosphorylation

- involve PS1 only

- only ATP produced

- no photolysis of water

- final acceptor not NADP, so no production NADPH

non-cyclic phosphorylation

- involve PSI and PSII

- ATP and NADPH produced

- involved photolysis of water

- final acceptor is NADP,so there is production NADPH